Modification of the conduction band edge energy via hybridization in quantum dots

Abstract

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Effects of dopants on the band structure of quantum dots: A theoretical and experimental study

“…The comparison between the experimental and theoretical onset energies are summarized in Table I. When compared to previously published data on a larger QD size 11 , we find that hybridization effects occur at much lower doping concentrations and fully support our hybridization model.…”

“…2) for the QDs in this manuscript have yielded sizes of 24, 31, and 43Å. In prior work, however, we suggested that certain features present in XAS may be used to determine particle size 11 . Figure 3 displays Cd M 3 -edge XAS for a series of undoped CdSe QDs.…”

“…II do not change if one considers Cu(I) versus Cu(II), so the hybridization effect is a property of the dopant atom itself, and not necessarily correlated to the native electronic structure of the dopant. Using a previously defined method 11 to determine the experimental value of the onset energy for the CB minimum, the theoretical model, described in Sec. II, should predict the shifts of the band gap due to both the hybridization and confinement terms.…”

“…The experimental energy resolution was ∼25 meV at the Cd M 3 -edge. Some of the data presented in this article was collected at the Canadian Light Source (CLS) as previously described 11 . …”

Effect of shell thickness on electrochemical property of wurtzite CdSe/CdS core/shell nanocrystals

“…The lowering of the HOMO level may be due to the energy level hybridization between Se and S anions at the interface of CdSe/CdS core/shell NCs. The hybridization phenomenon in NCs has been revealed with the XANES (X-ray absorption near edge structure spectroscopy) measurement [30]. The CV results with type II CdTe/CdSe NCs have indicated that the CV information comes from both the core and shell, and it is mainly from the shell in the case of thicker shell, so it is suggested that the E CV g value is affected by not only the electronic level of the CdSe core but also that of the CdS shell, and the electrochemical CV method reflects the information about shell in core/shell system if the surrounding shell is very thick, similar to the case of type II core/shell NCs [24].…”